Choke-bore-forming device.



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arnnr tripa ALFRED GEORGE ADELMAN, OF BOISE, IDAHO.

iGl-lOiEmBREmFOHlWlNG DEVlCE..

SIECIFICATION forming part of Letters Patent No. 640,518, dated January 9, 1900- Applieation lod lfley 2,1899. Serial No. '715,365` (No model.)

To all whom it may conceive.'

Beit known that I, ALFRED GEORGE ADEL- MAN, of Boise, in the county of Ada and State of Idaho, have invented a new and Improved Dhoke-Borehorming Device, of which th e following is a full, clear, and exact description.

lily invention relates to an improvement in devices for producing the choke-bore in shotguns, and comprises the novel features which will be hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forminga part of this specication, in which similar characters of reference indicate corresponding parts in all the views.

Figure I is a longitudinal section of the device in use. Fig. 2 is a section taken on the line 2 2 oi l; and Fig. 8 is a detail view of a reamer which may be used in connection with my device for truing up the ends of gunbarrels.

@ne manner in which the choke may be produced in gun-barrels is by the use of a die which surrounds the end of the barrel and to which sufficient pressure is applied to contract the diameter of the barrel, and thus to produce the required decrease in the diameter of the bore,

The object of my invention is to provide a portable device by which this work may be done and which shall be rapid in its operation and cheap of manufacture.

The swaging-die. D, which is used in connection with my device, consists of a short tube, which is tapering in its interior to correspond with the taper desired for the bore of the gun-barrel and is secured to or formed as a part of a base D', which is square in crosssection or of some other non-circular section, so that it may be placed within a socket and held against turning. The hase of this die is placed in a socket formed in a plate E, which has arearward tubular extension E' surrounding the central rod B. The periphery of the plate E is toothed at e, as is clearly shown in Figs. I and 2, so that it may be engaged and turned by a double-acting pawl f, mounted upon a lever F, said lever having a sleeve F surrounding' the tubular extension E' ot' the plate E. The die is held in place within the sochet in the plate E by means of a plate II, which is secured hy any suitable means to the face of the plate E and extends over the base of the die. The rear end of the tubular eX- tension E bears against a thrust-block I, which is screwed upon the rod B. This extension E also enters a counterbore in the hub of the thrust-block I, which forms a sleeve I. The tubular extension E/ is also provided With holes g, adapted to receive the ends of bolts or set-screws G,by which the paris may be locked together for an automatic feed or held together when not in use. 'lhe thrust-block I is provided with handles J, by means of which it may be turned, so as to feed the die upon the gun-barrel.

The rod B is provided with a sleeve B, located just insideof the muzzle of the gun-barrel and snugly fitting the same, forming a support for the rod. The rod extends throughout substantially the length of the gun-barrel and is screwed into a plug C, which snugly fits the cartridge-chamberat the breech of the gun-barrel. This plug also has a collar C', which bears against the end of the gun-barrel at the breech, and has a square extension C2, which may be engaged by a Wrench.

In use the device is placed within a gunbarrel A, as shown in Fig. I, and the thrustblock I screwed upon the rod B until the die D engages the muzzle of the barrel. The die is rotated, being at the same time fed farther upon the gun-barrel until the required amount of choke has been given to the barrel. Dies D may be provided of such a size as to fit all the different gages of guns, and plugs C of corresponding sizes are provided, so that the device may be used for any gage of gun. The device is also capable of use with gunbarrels of any length, as the rod B may be threaded throughout as large a portion of its length as desired.

If it is desired to true up the muzzle of the gun before the choking operation is begun, this maybe done by means of a reamer, such as is shown in Fig. 3, which is inserted instead of the die D. This reamer, as herein shown, consists of a base L2, which iits the socket in the base E and has a smooth conical plug L and a shoulder L.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. A chOke-bOrefOrming device, comprising a swaging-die adapted to embrace the muzzle IOO end of the gun-barrel, a rod passing through the gun-barrel and having a rotative connection with the sWaging-die, means for supporting the rod from the breech end of the gunbarrel, and means for turning the die.

2. A choke-boreforming device, comprising a swaging-die adapted to embrace the muzzle end of a gun-barrel, a plug or cap entering the breech end of the gun-barrel, a rod adapted to lie within the gun-barrel and engaging the plug and die, a thrust-block screwed upon 1 the rod and supporting the die, and means for turning the die.

3. A choke-bore-forming device, comprising a swaging-die adapted to embrace the muzzle end of the gun-barrel, a plug or cap entering the breech end of the gun-barrel, a rod adapted to lie Within the gun-barrel and connecting the plug and die, a thrust-block screwed upon the rod, a holder for the die having ratchet-teeth thereon, and a pawl and lever with which to rotate said holder and die.

4. Achoke-bore-forming device, comprising a sWaging-die adapted to embrace the muzzle end of a gun-barrel, a rod passing through gun-barrel and screwing Within said plug, a

thrust`block screwing upon the muzzle end of the rod outside the die, and independent means for turning both die and thrust-block.

6. A choke-bore-forming device, comprising a sWaging-die adapted to embrace the muzzle of the gun-barrel, means for supporting the end thrust thereof from the gun-barrel, and means for turning the die, substantially as described.v

ALFRED GEORGE ADELMANi Witnesses:

JAMES T. HOUSE, WILLIAM G. SCHULTZ. 

